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31,207 Article Results

Backstepping Control for MPPT and UPF of a Three Phase Single Stage Grid Connected PV System

10.11591/ijra.v7i4.pp262-272
M. El malah , A. Ba-razzouk , M. Guisser , E. Abdelmounim , M. Madark
This paper presents a new control methodology of a three phase grid connected photovoltaic system without using the intermediary DC/DC converter. Based on the synchronized nonlinear model of the whole photovoltaic system, two controllers have been proposed for the three-phase inverter in order to ensure the operation of the PV system at the maximum power point with unity power factor and minimum grid disturbance. Grid synchronization has been ensured by a three-phase 2nd order PLL (Phase-Locked Loop). The stability of each controller is demonstrated by means of Lyapunov analysis and evaluated under changing atmospheric conditions using the Matlab/Simulink environment, the simulation results clearly demonstrate the performance provided by each controller.
Volume: 7
Issue: 4
Page: 262-272
Publish at: 2018-12-01

Design of Compact Dual Band Circular Polarized Micro-strip Antenna for High Efficiency WLAN 802.11ax-2019

10.11591/ijict.v7i3.pp135-140
Syed Muhammad Ali
Design of antennas for the latest upcoming standards of WLANs is considered as a key challenge in the science of Mobile Communication Engineering. Micro strip antennas are supposed to have some quality features in mobile and wireless network systems. Their weight and size are reduced and they are capable of having low power capacity. All these interesting features enabled these type of antennas suitable for the communication of IEEE 802.11ax-2019 high speed WLANs. Shape of these antennas can be designed in an efficient manner to achieve required gain and bandwidth. In this paper the concept of circular polarization has been introduced along with compact design of antennas in order to achieve return loss and axial ratio of less than -10 dB and 3dB respectively. Antenna has been designed and simulated on CST MW studio software and usage of dual bands 2.4 and 5.2GHz having circular polarization is properly elucidated for 802.11ax-2019.
Volume: 7
Issue: 3
Page: 135-140
Publish at: 2018-12-01

Hierarchical Inspection System Using Visual and MFL Probe Robots

10.11591/ijra.v7i4.pp283-296
Uvais Qidwai , Muhammad Akbar , Muhammad Maqbool , Mohammed Jahanshahi
Structural Health Monitoring (SHM) represents a critical appurtenance to modern engineering that amalgamates the skills and techniques from various disciplines of engineering and computational science. Modern civil architectures, involving high-rise buildings, complex structural designs, and innovative shapes, on one hand represent the urban development, but at the same time is a challenge from sustainability perspective. In order to ensure the tenability of such structures, advanced SHM procedures need to be developed. The presented work in this paper is an effort on these lines. The wear and tear in the buildings related to weather, as well as other natural disasters, needs to be monitored regularly and systematically in order to prevent any serious structural damage. In current SHM practices, human experts are deployed at various structurally critical places on these buildings to perform specific measurements and analyze them to decide on the structural health condition. This simple approach is becoming more and more complicated as well as perilous for the human personnel involved, due to the modern architecture that involves greater heights, and complex structures. The proposed system utilizes flying and crawling/roving robots for this purpose. The flying robots, first, scan the surface of the building to any height needed, and then the custom-designed algorithms analyze the images from these scans in order to discern the possible defects/anomalies in the structure. Using these defect pointers, the custom-designed rover robot on top of the structure lowers a robotic probe that scans only those areas for substantiating the anomalies and the degree of defects present.
Volume: 7
Issue: 4
Page: 283-296
Publish at: 2018-12-01

Dental and Oral Health Education for Elemetary School Students through Patient Hygiene Performance Index Indicator

10.11591/ijere.v7i4.14856
Septian Emma Dwi Jatmika , Muchsin Maulana
Caries is a problem that often occurs in school-age children. Special Region of Yogyakarta is a province that has a high DMF-T index by 5.9 and exceeds the national DMF-T index. One of the efforts to improve dental and oral health of school-age children is the health education method using simulation methods, as well as simple techniques that may attract children's attention and be understood. The aim of the current study is to knowing the influence of oral and dental hygiene education intervention on dental and oral hygiene level at SD Negeri 3 Sleman students. This research used a kind of quasi experimental research with one group pretest posttest design. The research was done in SD Negeri 3 Sleman, the sample used was the 3rd graders from 57 students in 2017. The intervention was done by dental and oral hygiene education. Respondents were examined related to their dental and oral hygiene levels. It was measured by the PHP Index (Patient Hygiene Perfomance) before and after the intervention. According to results, The average score of respondents’dental and oral hygine pre test was 0.0823 and the average post test score of respondents’dental and oral hygiene was 1.4830. There is the difference of 1.4007. This shows an increament in oral hygiene of the respondent before and after the education. The results of statistical analysis show that there is an influence of oral and dental hygiene which pvalue 0,000 <0.05. Thus, there is a need for dental and mouth hygiene education to be conducted regularly and delivered with an interesting method.
Volume: 7
Issue: 4
Page: 259-263
Publish at: 2018-12-01

Smart Home Automation System based on Arduino

10.11591/ijra.v7i4.pp215-220
Bouzid Mohamed Amine , Chaib Fatima Zohra , Hamani Ilyes , Aid Lahcen , Allaoui Tayeb
Intelligent home environments are environments that attempt to ease the user's life in different ways and make it more comfortable using the technology. This paper present the principle of realizing a home control interface based on an. Arduino UNO R3 board equipped with a programmable ATmega328 microcontroller. The sketch to be uploaded to the Arduino is written in C language. A desktop application was created in C # language to communicate with the Arduino via the serial port, thus facilitating repetitive tasks such as lighting control, opening / closing doors. A temperature / humidity sensor, an alarm (motion sensor + buzzer), garden lighting and automatic control of the TV via an IR receiver + IR transmitter have been added without forgetting manual control
Volume: 7
Issue: 4
Page: 215-220
Publish at: 2018-12-01

Orientation to Happiness as a Predictor of University Students’ Engagement

10.11591/ijere.v7i4.15446
Maria Fernanda Durón-Ramos , Fernanda García Vázquez
There is empirical evidence for a close link between positive personal components and students' engagement in academic activities. Personal well-being is a construct that can be studied from a variety of angles. Recent studies point to the relevance of orientation to happiness examining three types of well-being. The main objective of this study is to test the relationship that orientation to happiness has with university students' engagement at a public institution in northern Mexico. A stratified probabilistic sample of 266 students was used. The internal consistency of the scales was analyzed using the SPSS package and a model of structural equations in the EQS program. Results indicate is a direct and significant relationship between the orientation to happiness and the students' engagement. This supports the importance of promoting positive factors in students to improve their academic and personal development.
Volume: 7
Issue: 4
Page: 294-298
Publish at: 2018-12-01

Design of Robust Controller for Higher Order Interval System using Differential Evolutionary Algorithm

10.11591/ijra.v7i4.pp232-250
D. Srinivasa Rao , M. Siva Kumar , M. Ramalinga Raju
This paper describes the design of the robust PI/PID controller for the higher order interval system via its reduced order model using the differential evolution (DE) algorithm. A stable reduced interval model is generated from a higher order interval system using the DE in order to minimize the cost and reduce the complexity of the system. This reduced order interval numerator and denominator polynomials are determined by minimizing the Integral Squared Error (ISE) using the DE. Then, using reduced order interval model, a robust PI/PID controller is designed based on the stability conditions for determining robust stability of interval system. Finally, using these stability conditions, a set of inequalities in terms of controller parameters is obtained from the reduced order closed loop characteristic polynomial. Then these inequalities are solved to obtain robust controller parameters with the help of a DE algorithm. The designed, robust controller from the reduced order interval model will be attributed to the higher order interval system. The designed PI/PID controller from our proposed method not only stabilizes the reduced order model, but also stabilizes the original higher order system. The viability of the proposed methodology is illustrated through the numerical example of its successful implementation. The efficacy of the proposed methodology is also evaluated against the available approaches presented in the literature and the results were successfully implemented.
Volume: 7
Issue: 4
Page: 232-250
Publish at: 2018-12-01

Hope as a Unique Agent of Resilience in Socio-economically Disadvantaged Adolescents

10.11591/ijere.v7i4.15354
Zeynep Aydın Sünbül , Ferah Çekici
The aim of this study was to explore the predictive effect of hope for resilience in socio-economically disadvantaged adolescents. Participants of the study were 692 (395 female, 297 male) students attending to 9th, 10th and 11th grades. The age range of the sample was 14-19 (M = 16.24, SD=.89). A convenient sampling was used to select the participants who are picked from four high schools located in low income regions. In order to collect data, The 14-Item Resilience Scale (Wagnild, 2010) and Dispositional Hope Scale (Snyder et al., 1991) were used as data collection instruments. The predictive effect of hope on resilience was analyzed through linear regression. Regression analysis yielded that hope explains 48% of the variance in the resilience scores of participants. This result indicates that hope is a powerful significant predictor of resilience for socio-economically disadvantaged adolescents.
Volume: 7
Issue: 4
Page: 299-304
Publish at: 2018-12-01

Reactive Power Tracing Index LQP_LT for Voltage Unstable Load Bus Identification in Power Systems

10.11591/ijeecs.v12.i3.pp889-898
Renuga Verayiah , Azah Mohamed , Syahirah Abd Halim
Existing power systems are significantly susceptible to voltage instability problem since such systems are stressed with the huge power transfers across the grids. To guarantee power system stability during stressed conditions, it is important to first identify the voltage unstable load buses to determine appropriate locations for under voltage load shedding. In this study, a new method is proposed for determining weak load bus locations by using reactive power tracing to develop a novel reactive power tracing capable index, named as LQP_LT.  The reactive power tracing algorithm is integrated with the LQP_LT index formulation to generate priority ranking list of weak load buses. The LQP_LT index was tested on the 57 bus system and the resulting priority ranking list is found to have successfully determined the weak load buses for load shedding in the test system. Comparison with other stability indices revealed that the LQP_LT has better sensitivity and response towards determining the location of the weakest load bus for under voltage load shedding implementation.
Volume: 12
Issue: 3
Page: 889-898
Publish at: 2018-12-01

An Efficient Framework to Improve QoS of CSP using Enhanced Minimal Resource Optimization based Scheduling Algorithm

10.11591/ijeecs.v12.i3.pp1179-1186
Ravi Mahadevan , Neelamegam Anbazhagan
Online Nowadays, the enterprises & individuals are contributing their workloads on cloud service providers which are going to increase on daily basis. There are   large amount CSP are available to offer virtualized and dynamic resource on pay and use basis. However, there are almost CSP failed to maintain quality of service (QOS) and minimal resource optimization. Some of the existing approaches are highly dedicated on scheduling policy but, it does not considered reliable services with optimized QOS. To offer best solution of above problem, the framework proposes Enhanced Minimal Resource Optimization based Scheduling Algorithm to minimize the resources and maintain the QOS.  The method avoids delay in Request-Response model in cloud environment. To avoid overload for resource allocation, the proposed design utilized optimized scheduling policy.  Proposed mechanisms utilized optimized service brokering policy to reduce the delay response in cloud environment. The framework also help cloud user to prefer best CSP according to their prior services. The method offers rising trend of resource based structure to reduce the placement churn extensively. Proposed system utilized efficient scheduling policy to transmit data request to CSP with minimal data processing time. The entire utilization is to improve the QOS of cloud service provider in the features of multi-dimensional resource. Based on experimental evaluations, proposed technique improves the CPT (Computation Processing Time) 301.72 milliseconds, BU (Bandwidth Utilization) 20 Mbps, CPUU (CPU Utilization) 5% & MRU (Memory Resource Utilization) 3% on given input parameters compare than existing methodology.
Volume: 12
Issue: 3
Page: 1179-1186
Publish at: 2018-12-01

Using Partial Credit Model to Improve the Quality of an Instrument

10.11591/ijere.v7i4.15146
Saras Krishnan , Noraini Idris
In using the Rasch model to improve the quality of an instrument, analysis purports to determine if the sample collaborates well with the items in the instrument such that the results are measuring a single underlying variable. The relevant properties of Rasch analysis are reliability and validity which are key indicators of the quality of a measurement instrument. This paper discusses the use of one type of Rasch model that is the Partial Credit Model to investigate reliability and validity of an instrument. By removing or changing items in the instrument when conditions of reliability and validity are not met, the quality of the instrument is improved.
Volume: 7
Issue: 4
Page: 313-316
Publish at: 2018-12-01

Detection and Separation of Eeg Artifacts Using Wavelet Transform

10.11591/ijict.v7i3.pp149-156
R. Suresh Kumar , P. Manimegalai
Bio-medical signal processing is one of the most important techniques of multichannel sensor network and it has a substantial concentration in medical application. However, the real-time and recorded signals in multisensory instruments contains different and huge amount of noise, and great work has been completed in developing most favorable structures for estimating the signal source from the noisy signal in multichannel observations. Methods have been developed to obtain the optimal linear estimation of the output signal through the Wide-Sense-Stationary (WSS) process with the help of time-invariant filters. In this process, the input signal and the noise signal are assumed to achieve the linear output signal. During the process, the non-stationary signals arise in the bio-medical signal processing in addition to it there is no effective structure to deal with them. Wavelets transform has been proved to be the efficient tool for handling the non-stationary signals, but wavelet provide any possible way to approach multichannel signal processing. Based on the basic structure of linear estimation of non-stationary multichannel data and statistical models of spatial signal coherence acquire through the wavelet transform in multichannel estimation. The above methods can be used for Electroencephalography (EEG) signal denoising through the original signal and then implement the noise reduction technique to evaluate their performance such as SNR, MSE and computation time.
Volume: 7
Issue: 3
Page: 149-156
Publish at: 2018-12-01

Item Analysis for the Adapted Motivation Scale Using Rasch Model

10.11591/ijere.v7i4.15376
Sar Ee Ng , Kee Jiar Yeo , Azlina bt Mohd Kosnin
The aim of this study was to measure the validity and reliability of an adapted motivation scale used in second language learning.  The Integrative and Instrumental motivation (IIM)  was developed based on two orientations of motivation, which were integrative motivation and instrumental motivation.  IIM was used to identify students’ level of motivation towards learning Chinese language as a second language (CLSL) in national school.  The study presented empirical evidence of validity and reliability using the Rasch Model.   Pilot study was conducted in a national school which has students enrolled for the CLSL class.   There were 29 students in this pilot study.  Data was  analyzed using WINSTEPS version 3.72.3.  The result showed the reliability of the motivation scale is 0.87 based on Cronbach’s alpha.  The construct validity was determined by PT-measure correlation value (PMC) range from 0.71 to 0.86, infit and outfit MNSQ  between 0.53 to 1.43 and ZSTD range from -1.1 to 1.2. In unidimensional measure, raw variance explained was at 66.4%  with the unexplanined variance in the first factor was at 13.6%.  Finally the fit statistics showed that person separation index, 2.79 was considered good and item separation index, 1.81was in acceptable range (Linacre,2012).  Person and item reliability were at 0.89 and 0.77 respectively.  The result indicated that the new instrument with 15 items-IIM after eliminated unfit items was a reliable and valid instrument to measure the motivation in learning CLSL in the context of national school.
Volume: 7
Issue: 4
Page: 264-269
Publish at: 2018-12-01

A New Frequency for Offshore Wind-farm Based on Component Loss Calculation

10.11591/ijape.v7.i3.pp227-234
Koganti Srilakshmi , P. Aravindhababu , P. Ravi Babu
Offshore wind power plants are gaining importance in recent years, as there is adequate space available for its installation, high wind speed, no restriction on the size of turbine blades (no transportation and construction problem) and blades can be allowed to rotate at higher speed without any noise constraint, thereby increasing the rated power. However, the existing offshore wind farms face greater cost related challenges than those of onshore plants. The integration of offshore wind farm with onshore power grid is a complex issue. Feasible solutions for power transmission through cables from offshore wind farms to onshore are HVAC, line commutated HVDC  and  VSC-HVDC.  This paper analyses the various schemes for integration of offshore wind farm with onshore power grid and suggests that LFAC with submarine cable operating at 0.7 Hz is an optimal choice in obtaining better performances. 
Volume: 7
Issue: 3
Page: 227-234
Publish at: 2018-12-01

Interleaved Flyback Converter with Embedded Grid Interacting PV Cascaded MLI

10.11591/ijape.v7.i3.pp277-283
Jaikrishna V , Subhranhsu Sekhar Dash , Linss T Alex , R. Sridhar
The importance of extracting power from renewable energy sources are increasing in the modern world as the power demand is increasing day by day and the non renewable energy sources are getting dried up. Solar power is a domestic source of energy and its availability throughout the year makes it a primary target to solve this crisis. It will never produce any hazardous waste or pollution. But various issues like Power quality problems and Harmonic distortion seep in due to the intermittent nature of PV system. This paper proposes a cascaded H–bridge multilevel inverter for grid connected PV system with a flyback converter. This helps to achieve maximum power point tracking and also provides isolation which will further help to increase system efficiency. The DC–DC flyback converters are cascaded to generate multilevel output voltage. Then this multilevel dc output is given to H bridge inverter to generate multilevel output. A new control algorithm is used in this paper which combines voltage–hold Perturb and observe method and modified PWM algorithm which helps to achieve the best MPPT. The proposed topology is implemented in PSIM. The Simulation and Hardware results reveal that the suggested technique is highly.
Volume: 7
Issue: 3
Page: 277-283
Publish at: 2018-12-01
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